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[Heroku] `require': Could not load the 'listen' gem. Add `gem 'listen'` to the development group of your Gemfile (LoadError)

Ruby
Rails
Heroku

Last updated at 2019-07-28Posted at 2019-04-26

問題

log

2019-04-26T21:17:14.759802+00:00 heroku[web.1]: State changed from starting to crashed
2019-04-26T21:17:14.643611+00:00 app[web.1]: /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require': Could not load the 'listen' gem. Add `gem 'listen'` to the development group of your Gemfile (LoadError)

解決

production.rbの以下行をコメントアウト

config/environments/production.rb

  # config.file_watcher = ActiveSupport::EventedFileUpdateChecker

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